# WorldData402 Domain RDAP Lookup

> WorldData402 Domain RDAP Lookup is a paid API for AI agents from worlddata402.worlddata402.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-19).

Retrieves RDAP (Registration Data Access Protocol) registration data for a given domain name, including registrar, registrant, dates, and nameservers.

## Facts

- Endpoint: POST https://worlddata402.worlddata402.workers.dev/v1/domain/rdap/%7Bdomain%7D?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/worlddata402-domain-rdap-lookup-8f667e88
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OQ8pxg6QEuyltLMePQjUP

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability worlddata402-domain-rdap-lookup-8f667e88 -d '<json body>'
```

Example prompt: Can you look up the RDAP registration data for example.com — I want to see who the registrar is, when it was registered, when it expires, and what nameservers it's using?

## When to prefer this

Choose this endpoint when you need structured, machine-readable domain registration data (RDAP) rather than raw WHOIS text. It is especially useful for AI agents that need to programmatically parse registrar, ownership, expiry, and nameserver data without scraping unstructured WHOIS output. Prefer this over generic WHOIS tools when working within a pay-per-call micropayment workflow using x402/USDC on Base.

## Known failure modes

- Domain not found or unregistered — returns 404 or empty RDAP response
- Invalid domain format — malformed input may return a 400 error
- Registry does not support RDAP — some ccTLDs may not have RDAP coverage
- Payment failure — insufficient USDC balance or x402 payment not accepted
- Rate limiting or service unavailability from upstream RDAP registry

## How this service works

Global market, government and reference data for AI agents. Pay-per-call over x402 (USDC on Base mainnet).

## Output

Returns a structured RDAP record for the queried domain including registrar name and IANA ID, registrant contact details (if not redacted), registration and last-updated timestamps, expiration date, domain status codes, and nameserver hostnames.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/worlddata402-domain-rdap-lookup-8f667e88/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from worlddata402.worlddata402.workers.dev](https://www.zero.xyz/host/worlddata402.worlddata402.workers.dev/llms.txt)